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2004, Number 4

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Vet Mex 2004; 35 (4)

Serological profile of porcine influenza virus, Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae, in farms of Yucatan, Mexico

Álvarez FM, Rodríguez BJC, Ciprián CA, Rodríguez GL, Ayora TG, Segura CJC

Language: English/Spanish
References: 38
Page: 295-305
PDF size: 275.50 Kb.


ABSTRACT

The objectives of this study were: to estimate the frequency of pigs that were seropositive to porcine influenza virus (PIV), Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae for each phase of production; as well as to determine the frequency of the most common serotypes of A. pleuropneumoniae and subtypes of PIV in fattening pigs. A cross-sectional study was carried out in 25 complete-cycle farms in the state of Yucatan, Mexico. The number of pigs sampled per farm was 40, ten pigs for each phase of production. Blood samples were collected to detect antibodies against PIV subtypes H1N1 and H3N2, M. hyopneumoniae and A. pleuropneumoniae. Data were analyzed using descriptive statistics and Chi-square tests. The frequency of farms positive to PIV was 56%, with 8.3% and 65.1% pigs seropositive to subtypes H1N1 and H3N2, respectively. The frequency of farms seropositive to M. hyopneumoniae was 100% and the individual frequency 29.7%. The frequency of seropositive farms to A. pleuropneumoniae serotype 1 was 100%. Forty-eight percent of the farms were positive to serotype 3, and 52% to serotype 7. Individual frequencies for serotypes 1, 3 and 7 were 11.5%, 7.4% and 10.1%, respectively. In conclusion, there was a high seroprevalence of PIV, M. hyopneumoniae and A. pleuropneumoniae in farms and pigs of the state of Yucatan. These infectious agents are distributed in the different phases of production of fattening pigs. The H3N2 and H1N1 subtypes of PIV and the serotypes 1, 3 and 7 of A. pleuropneumoniae were the most frequent.


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